GSM不响应

Question

我正在设计一种设备来控制温度并在温度太高或太低时发送短信。我正在使用arduino，DHT22传感器和DFrobot Gravity UART A6（GSM模块）。传感器工作正常，但由于停止响应，我仍然遇到GSM问题。这是我正在使用的代码，这是DFRobot的标准代码示例：

#include <SoftwareSerial.h>
SoftwareSerial mySerial(11, 10);  // TX-Pin11, RX-Pin10
void updateSerial()
{
delay(2000);
while (Serial.available()) {
mySerial.write(Serial.read());//Forward what Serial received to Software Serial Port
}
while(mySerial.available()) {
Serial.write(mySerial.read());//Forward what Software Serial received to Serial Port
}
}
void setup()
{
Serial.begin(9600);
mySerial.begin(9600);
}

void loop()
{
mySerial.println("AT");          //Once the handshake test is successful, it will back to OK
updateSerial();

mySerial.println("AT+CSQ");      //Signal quality test, value range is 0-31, 31 is the best
updateSerial();

mySerial.println("AT+CCID");    //Read SIM information to confirm whether the SIM is plugged
updateSerial();

mySerial.println("AT+CREG?");    //Check whether it has registered in the network
updateSerial();

mySerial.println("AT+SNFS=0");  //Adjust to earphone mode(AT+SNFS=1 is microphone mode)
updateSerial();

mySerial.println("AT+CRSL=2");  //Adjust volume, volume range is 0-15, maximum:15
updateSerial();

while(1)
{
if(mySerial.available())
{
Serial.write(mySerial.read());   //Forward what Software Serial received to Serial Port
if(Serial.available())
{
  mySerial.write(Serial.read());  //Forward what Serial received to Software Serial Port
}
}
}
}

结果是，我不断收到“ ???”。而且我不知道该怎么办了。我今天用oscyloskope检查了信号，一切正常。请帮助:)

Answer 1

您的代码很好；考虑到您使用的是调制解调器制造商提供的示例，这不足为奇。

下一个最可能的解释是您的接线有问题。因此，请确保调制解调器上的TX到达开发板上的引脚11，RX到达引脚10。

您不是the first遇到此问题。